【重识 HTML (4),ELK原来这么简单

cxy喜喜呀 2021-08-08 21:45:32
java 后端 程序员


博文集合:【重识 HTML + CSS】知识点目录

CSS 属性的继承

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CSS中有些属性是可继承的,何为属性的继承?

  • 一个元素如果没有设置某属性的值,就会跟随父元素的值

  • 当然,一个元素如果有设置某属性的值,就使用自己设置的值

比如 colorfont-size 等属性都是可以继承的

究竟哪些属性可以继承,不用死记硬背,用多了自然熟练。而且可以随时查阅官方文档找到答案

不能继承的属性,一般可以使用 inherit 强制继承

浏览器的开发者工具也会标识出哪些样式是继承过来的

在这里插入图片描述

继承的注意点


CSS 属性继承的是计算值,并不是当初编写属性时的指定值(字面值)

在这里插入图片描述

CSS 属性的层叠

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CSS 允许多个相同名字的 CSS 属性层叠同在一个元素上

  • 层叠后的结果是:只有一个 CSS 属性会生效

  • 浏览器的开发者工具非常清晰地显示了哪个 CSS 属性会生效

  • 哪个 CSS 属性会生效,取决于 CSS 属性所处环境的优先级高低

    在这里插入图片描述

CSS 属性的优先级

=============================================================================

按照经验,为了方便比较 CSS 属性的优先级,可以给 CSS 属性所处的环境定义一个权重

  • !important:10000

  • 内联样式:1000

  • id选择器:100

  • 类选择器、属性选择器、伪类:10

  • 元素选择器、伪元素:1

  • 通配符:0

比较优先级的严谨方法:

  • 从权值最大的开始比较每一种权值的数量多少,数量多的则优先级高,即可结束比较

  • 如果数量相同,比较下一个较小的权值,以此类推

  • 如果所有权值比较完毕后,发现数量都相同,就采取“就近原则”

最后

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MyBatis答案解析
由于篇幅限制,文档的详解资料太全面,细节内容太多,所以只把部分知识点截图出来粗略的介绍,每个小节点里面都有更细化的内容!

大家看完有什么不懂的可以在下方留言讨论也可以关注。

觉得文章对你有帮助的话记得关注我点个赞支持一下!

版权声明
本文为[cxy喜喜呀]所创,转载请带上原文链接,感谢
https://blog.51cto.com/u_15308636/3314471

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